[sql] Import reference version of SQLite 3.7.6.3.

third_party/sqlite/sqlite-src-3070603/tool/showdb.c

 /*
 ** A utility for printing all or part of an SQLite database file.
 */
 #include <stdio.h>
 #include <ctype.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <stdlib.h>
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         exit(1);
       }
       while( iStart<=iEnd ){
         print_page(iStart);
         iStart++;
       }
     }
   }
   close(db);
 }